US9541163B2 - Transmission, in particular for an adjustment drive - Google Patents

Transmission, in particular for an adjustment drive Download PDF

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Publication number
US9541163B2
US9541163B2 US14/365,916 US201214365916A US9541163B2 US 9541163 B2 US9541163 B2 US 9541163B2 US 201214365916 A US201214365916 A US 201214365916A US 9541163 B2 US9541163 B2 US 9541163B2
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United States
Prior art keywords
gear mechanism
gear
worm gear
worm
wedge surface
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US14/365,916
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English (en)
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US20150000444A1 (en
Inventor
Willi Schmidt
Anja Burger
Gerhard Genter
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of US20150000444A1 publication Critical patent/US20150000444A1/en
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BURGER, Anja, GENTER, GERHARD, SCHMIDT, WILLI
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/02—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable
    • B60N2/04—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable
    • B60N2/16—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable
    • B60N2/1635—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles the seat or part thereof being movable, e.g. adjustable the whole seat being movable height-adjustable characterised by the drive mechanism
    • B60N2/166—Worm and worm gear articulations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/0006—Vibration-damping or noise reducing means specially adapted for gearings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/19698—Spiral
    • Y10T74/19828—Worm

Definitions

  • the present invention relates to a gear mechanism, in particular for an adjustment drive, and to an adjustment drive, in particular for a motor vehicle seat, comprising at least one gear mechanism.
  • DE 10 2004 013 543 A1 presents an adjustment drive having a gear mechanism.
  • the gear mechanism comprises a worm gear mechanism stage and an eccentric mechanism stage.
  • so-called “chatter vibrations” can occur in particular during a lowering operation as part of a seat height adjustment.
  • the gear mechanism according to the invention makes it possible for chatter vibrations to be eliminated.
  • the gear mechanism according to the invention prevents chatter vibrations and thus the generation of noise during the lowering of the seat.
  • a first wedge surface is formed on the worm gear or on an element that is fixedly connected to the worm gear. Said first wedge surface thus rotates together with the worm gear and is fixedly connected to the worm gear.
  • the gear mechanism comprises a brake element with a second wedge surface. Said brake element is arranged so as to be rotationally fixed with respect to the worm gear.
  • the brake element is mounted rotationally fixedly in the housing.
  • the first wedge surface lies areally against the second wedge surface.
  • a spring is provided which is arranged so as to press the two wedge surfaces toward one another. It is provided here in particular that the spring is supported with one end against the housing and with the other end against the brake element. The spring thus exerts load on the brake element in the axial direction, that is to say in the direction of the axis of rotation of the worm gear. It is preferable here for one spring or multiple springs to be arranged so as to be distributed over the circumference.
  • the spring may be a spiral spring, a plate spring or an elastomer spring (O-ring).
  • the two wedge surfaces are inclined by the same angle with respect to the axis of rotation of the worm gear.
  • the inclination with respect to the axis of rotation of the worm gear gives rise to a braking moment in the radial direction of the worm gear when the first wedge surface rubs against the second wedge surface, wherein, at the same time, a force can be transmitted in the direction of the axis of rotation of the worm gear.
  • an angle between the first and second wedge surfaces and the axis of rotation of the worm gear is less than 90° and greater than 0°.
  • said angle lies between 85° and 5°, in particular between 70° and 20°, in particular between 60° and 30°.
  • the first wedge surface is formed over the full circumference on an inner surface of the worm gear or on an inner surface of an element that is fixedly connected to the worm gear.
  • the first wedge surface can be arranged in the gear mechanism in a space-saving manner.
  • An “inner surface” is to be understood to mean a surface which faces toward the axis of rotation of the worm gear.
  • the brake element is in the form of a closed ring, wherein the second wedge surface is formed over the full circumference on the ring.
  • the first wedge surface is also preferably formed over the full circumference.
  • the two wedge surfaces are in particular arranged coaxially with the axis of rotation of the worm gear.
  • the gear mechanism preferably comprises a self-locking gear mechanism stage.
  • Said self-locking gear mechanism stage is in particular arranged at the drive output side of the worm gear.
  • the worm gear thus transmits a rotation and a torque to said self-locking gear mechanism stage.
  • said gear mechanism stage it is preferable for said gear mechanism stage to be formed as an eccentric mechanism stage, a planetary gear mechanism stage or as a screw mechanism stage.
  • the invention furthermore encompasses an adjustment drive, in particular for a motor vehicle seat, comprising at least one of the gear mechanisms described above and an electric motor, in particular a permanently excited direct-current motor, for driving the worm shaft. It is particularly preferable for the spring described above to be arranged so as to press the brake element with the second wedge surface in the direction of the drive output, in particular in the direction of the self-locking gear mechanism stage.
  • the adjustment drive according to the invention is utilized in particular for seat height adjustment of a motor vehicle seat.
  • FIG. 1 shows a first sectional view of the gear mechanism according to the invention, as per a first exemplary embodiment
  • FIG. 2 shows a second sectional view of the gear mechanism according to the invention, as per the exemplary embodiment.
  • FIG. 1 shows a gear mechanism 1 for an adjustment drive, in particular for a motor vehicle seat.
  • the gear mechanism 1 comprises a housing 2 , a worm shaft 3 which is rotatably mounted in the housing 2 , and a worm gear 4 which is rotatably mounted in the housing 2 .
  • the worm gear 4 meshes with the worm shaft 3 .
  • a first wedge surface 5 is formed on an inner surface of the worm gear 4 over the full circumference of the worm gear 4 .
  • the first wedge surface 5 is arranged coaxially with respect to an axis of rotation 9 of the worm gear 4 .
  • a brake element 6 Said brake element 6 is accommodated in a rotationally fixed manner in the housing 2 .
  • the brake element 6 is in the form of a closed ring.
  • a second wedge surface 7 is formed on the brake element 6 .
  • the second wedge surface 7 is arranged over the full circumference around the entire brake element 6 .
  • the second wedge surface 7 is aligned coaxially with respect to the axis of rotation 9 of the worm gear 4 .
  • the brake element 6 is linearly movable in the direction of the axis of rotation 9 .
  • Said spring 8 is also referred to as axial spring. The spring 8 pushes the brake element 6 against the first wedge surface 5 in the direction of the axis of rotation 9 . In this way, the first wedge surface 5 lies against the second wedge surface 7 .
  • both a force acting in the axial direction and also a braking moment acting in the direction of rotation around the axis of rotation 9 are transmitted to the worm gear 4 .
  • chatter vibrations in the worm gear 4 are dampened.
  • FIG. 1 shows, by way of the reference sign F, the force exerted on the brake element 6 by the spring 8 . Also shown in FIG. 1 is an angle ⁇ . The first wedge surface 5 and the second wedge surface 7 are inclined with respect to the axis of rotation 9 by said angle ⁇ .
  • FIG. 1 shows a journal 10 .
  • the journal 10 is installed fixedly in the housing 2 .
  • An eccentric element 11 and a drive output element 14 are rotatably mounted on said journal 10 .
  • the eccentric element 11 is connected rotationally conjointly to the worm gear 4 .
  • An eccentric gear 12 is mounted rotatably on the eccentric element 11 .
  • Said eccentric gear 12 is in the form of a spur-toothed gearwheel.
  • the drive output element 14 comprises a toothed internal gear 13 .
  • the internal gear 13 meshes with the eccentric gear 12 .
  • first wedge surface 5 being implemented on the worm gear 4
  • first wedge surface 5 it is for example also possible for the first wedge surface 5 to be formed on the eccentric element 11 .
  • FIG. 2 shows a further section through the gear mechanism 1 as per the exemplary embodiment.
  • the section is along the line A-A (see FIG. 1 ).
  • the brake element 6 comprises two inwardly projecting projections 15 . Said two projections 15 engage into corresponding grooves in the housing 2 . By means of said projections 15 , the brake element 6 is accommodated in a rotationally fixed and linearly movable manner in the housing 2 .
  • the boost factor for the frictional torque at the wedge surfaces 5 , 7 is defined by way of the angle ⁇ . It is thus possible even with relatively low spring forces to achieve high frictional torques for eliminating chatter vibrations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Gear Transmission (AREA)
US14/365,916 2011-12-14 2012-10-05 Transmission, in particular for an adjustment drive Active 2033-06-26 US9541163B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102011088475A DE102011088475A1 (de) 2011-12-14 2011-12-14 Getriebe, insbesondere für einen Verstellantrieb
DE102011088475.0 2011-12-14
DE102011088475 2011-12-14
PCT/EP2012/069778 WO2013087248A1 (de) 2011-12-14 2012-10-05 Getriebe, insbesondere für einen verstellantrieb

Publications (2)

Publication Number Publication Date
US20150000444A1 US20150000444A1 (en) 2015-01-01
US9541163B2 true US9541163B2 (en) 2017-01-10

Family

ID=46982613

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/365,916 Active 2033-06-26 US9541163B2 (en) 2011-12-14 2012-10-05 Transmission, in particular for an adjustment drive

Country Status (5)

Country Link
US (1) US9541163B2 (de)
EP (1) EP2791552B1 (de)
CN (1) CN104053927B (de)
DE (1) DE102011088475A1 (de)
WO (1) WO2013087248A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10724603B2 (en) * 2015-12-01 2020-07-28 Lg Innotek Co., Ltd. Parking brake actuator
US9963050B2 (en) 2016-02-25 2018-05-08 Ford Global Technologies Llc Manual seat height adjuster mechanism
JP6809154B2 (ja) * 2016-11-10 2021-01-06 株式会社デンソー パワーシートモータ、及びパワーシートシステム
JP7459652B2 (ja) * 2020-05-22 2024-04-02 株式会社デンソー 減速機付モータ

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847869A (en) * 1954-11-22 1958-08-19 Cleveland Pneumatic Ind Inc Inertia actuator
DE7638490U1 (de) 1976-12-09 1977-11-24 Geiger, Gerhard, 7120 Bietigheimbissingen Schneckengetriebe
US4487391A (en) * 1981-01-26 1984-12-11 Metallwerk Max Brose Gmbh & Co. Seat adjustment mechanism particularly for a motor vehicle seat
US4747319A (en) * 1985-12-16 1988-05-31 Jidosha Kiki Co., Ltd. Actuator
US4979404A (en) 1987-06-25 1990-12-25 Asmo Co., Ltd. Gear backlash adjusting mechanism
DE29702062U1 (de) 1997-02-06 1997-03-27 Mayr Christian Gmbh & Co Kg Schaltbare Rutschnabe im Schneckengetriebe
US5655405A (en) * 1994-06-03 1997-08-12 Valeo Systemes D'essuyage Motorized reduction gear unit, especially for a vehicle screen wiping apparatus
DE19619955A1 (de) 1996-05-17 1997-11-20 Teves Gmbh Alfred Schneckenradgetriebe
US20070161451A1 (en) 2004-03-19 2007-07-12 Gerhard Genter Eccentric gear mechanism
CN2931949Y (zh) 2006-05-25 2007-08-08 株洲易力达机电有限公司 电动助力转向器蜗杆预紧装置
US7331252B2 (en) * 2003-10-29 2008-02-19 Yavor Pachov Braking system
US20090152057A1 (en) * 2007-12-13 2009-06-18 Asmo Co., Ltd. Brake device and motor with speed reducing mechanism
US7658124B2 (en) * 2006-07-27 2010-02-09 Caterpillar Inc. Compliant gear assembly and work machine using same

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847869A (en) * 1954-11-22 1958-08-19 Cleveland Pneumatic Ind Inc Inertia actuator
DE7638490U1 (de) 1976-12-09 1977-11-24 Geiger, Gerhard, 7120 Bietigheimbissingen Schneckengetriebe
US4487391A (en) * 1981-01-26 1984-12-11 Metallwerk Max Brose Gmbh & Co. Seat adjustment mechanism particularly for a motor vehicle seat
US4747319A (en) * 1985-12-16 1988-05-31 Jidosha Kiki Co., Ltd. Actuator
US4979404A (en) 1987-06-25 1990-12-25 Asmo Co., Ltd. Gear backlash adjusting mechanism
US5655405A (en) * 1994-06-03 1997-08-12 Valeo Systemes D'essuyage Motorized reduction gear unit, especially for a vehicle screen wiping apparatus
DE19619955A1 (de) 1996-05-17 1997-11-20 Teves Gmbh Alfred Schneckenradgetriebe
DE29702062U1 (de) 1997-02-06 1997-03-27 Mayr Christian Gmbh & Co Kg Schaltbare Rutschnabe im Schneckengetriebe
US7331252B2 (en) * 2003-10-29 2008-02-19 Yavor Pachov Braking system
US20070161451A1 (en) 2004-03-19 2007-07-12 Gerhard Genter Eccentric gear mechanism
CN2931949Y (zh) 2006-05-25 2007-08-08 株洲易力达机电有限公司 电动助力转向器蜗杆预紧装置
US7658124B2 (en) * 2006-07-27 2010-02-09 Caterpillar Inc. Compliant gear assembly and work machine using same
US20090152057A1 (en) * 2007-12-13 2009-06-18 Asmo Co., Ltd. Brake device and motor with speed reducing mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
International Search Report for Application No. PCT/EP2012/069778 dated Dec. 19, 2012 (English Translation, 2 pages).

Also Published As

Publication number Publication date
EP2791552B1 (de) 2016-02-03
CN104053927B (zh) 2017-07-21
EP2791552A1 (de) 2014-10-22
DE102011088475A1 (de) 2013-06-20
WO2013087248A1 (de) 2013-06-20
US20150000444A1 (en) 2015-01-01
CN104053927A (zh) 2014-09-17

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